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參數(shù)資料
| 型號(hào)： | FSCT17A-UH5 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PSIP5 |
| 封裝： | IPPAK-5 |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 123K |
| 代理商： | FSCT17A-UH5 |
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9/11
These interfaces offer very low thermal resistance. For example, the Sil-Pad 800 family, from
BERGQUIST, which is designed for low cost applications and low mounting pressures, present a typical
thermal impedance of 0.45 °C.in/W. This impedance can increase up to 0.92 °C.in/W for a 10 psi pres-
sure, which is below the normal atmospheric one (1 atm = 1013 hPa = 1013 x 100 x 14.5 x 10-3 = 14.7 psi).
Furthermore, a mounting clip will apply a force between 15 to 50 N. This leads to a 25 to 200 psi pressure.
In this case, the thermal impedance varies from 0.6 to 0.29 °C.in/W for the Sil-Pad 800 family.
For the example, we take the worst case hypothesis of a 1°C.in/W interface between the FSCT case and
the heat sink.
We take into account only the tab surface for the heat exchange. This surface equals typically:
S = 4.7 x 5.1 mm2 = 0.037 in2
This yields to a supplementary resistance of: Rthc-h = 1/0.037 = 27°C/W
Then, the maximum power dissipated in the FSCT, for the maximum output power, is given by the following
equation:
PI
V
I
V
CC
OUT
OMS
max =
+
The following numerical application gives (for a 150 mA FAN DC current, a 80 gain for the PNP and a 12 V
power supply):
IOUT = 150 / 80 = 1.87mA
PmW
max
..
=×
×
+
×
=
3
12
10
187
5 5
10
46
33
Then, the temperature error is:
()
TC
=×
+
=
°
0 046
3
27
138
..
The temperature sensing error can then be neglected whan one considers the operation range (from 0 to
100 °C), even with low cost interface material and without any mounting clip. For example, with a higher
pressure, thanks to a clip, this error could be divided by three.
4. TEMPERATURE/VOLTAGE SLOPE CHANGE
The OUT voltage versus temperature characteristic of the FSCT has been designed to fit majority cases of
application, in the field of PC power supplies.
The advantage for the user is to have a minimum count of components while achieving a smart
temperature regulation.
Nevertheless, some applications require dedicated temperature regulation characteristic.
Figure 13
provides an example of a solution which allows to change the ratio between PNP base voltage and the
temperature. This schematic only requires a dual
single-voltage amplifier (in DIL8 package for
example) and less than ten supplementary
resistors.
This schematic keeps the advantage of applying a
constant minimum voltage (VOMS) below TMS tem-
perature. Indeed, the U1A operational amplifier
subtracts 5.1 V (thanks to the D1 Zener diode, re-
fer to VREF) from VOUT. This means that the ratio
change is only taken into account when VOUT is
lower than 5.1 V. For higher voltages (VOMS in mode
ON or VCC in mode OFF), the new base to GND volt-
age (VNEW) remains the same (cf. figure 12).
So, if one wants to increase accurately the
voltage-temperature ratio, i.e. that VOUT will
decrease more quickly when Tj increases, figure
13 schematics should be implemented. Indeed,
the voltage at the operational amplifier U1B (which
acts as a follower) output is:
()
VV
if V
V
VV
RN
RD
V
otherw
NEW
OUT
REF
NEW
OUT
REF
OUT
=>
=
ise
Mode OFF
Mode ON
VOUT
VNEW
T (°C)
j
VOMS
Step-down
TON
TOFF
Fig. 12: Modified characteristics.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSCTEST | 制造商:Fairchild Semiconductor Corporation 功能描述:. |
| FSCTXXA-UH5 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:FAN SPEED CONTROLER |
| FSCUPMAD | 制造商:Intel 功能描述:Electrical Enclosure Accessories Air Duct Spare FSCUP MAD |
| FSCUPMAD 915622 | 制造商:Intel 功能描述:AIR DUCT SPARE - Bulk |
| FSCUPSAD | 制造商:Intel 功能描述:Electrical Enclosure Accessories Air Duct Spare FSCUP SAD |
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